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Anonymous
Subtracting a negative number has the same effect as adding a positive number. In this case, 25 - (-30) = 25 + 30 = 55.
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-5 - 25 = -30
-14 - +7 - -25 = 4
-3 minus -28 is 25
10 minus -20 is 30.
-5 - -25 = 20